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    <script>
        /* 
        1.比较运算符: > < == === !=  >= <=
        2.返回值是 布尔值
        3.== 由隐式转化的过程
        4.===比较值,和数据类型
        5.学习的一个原则
           输入:
           处理:
           输出:
        */

        console.log(2 > 5); //false
        console.log(18 == 18)   //true
        console.log(18 == 'mmmmmmmmmmmmmmmmmm'.length);  //true
        console.log(18 === '18');   //false
    </script>
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